Designation

Name

The value

Designation GOST Cyrillic

30ХМА

Designation GOST Latin

30XMA

Transliteration

30HMA

By chemical elements

30CrMo

Description

30KHMA steel is used: for the production of forgings for General purpose rotors and disks of steam turbines, flanges, gears, shafts, axles, pins, nuts, bolts and various other parts operating at temperatures up to 450−500°C; details of pipeline valves by conducting the heat treatment; tubes for plants of chemical and petrochemical plants with nominal pressure PN=19.6−98 MPa (200−1000 kgf/cm2); pipes, designed for pipes in installations for the production of ammonia with a working pressure of PN=31 MPa (320 kgf/cm2); seamless pipes for the fabrication of parts and structures in motovelotehnika; wire intended for the manufacture of rivets and bolts by cold heading.

Fe is the basis. GOST 4543-71 regulates the content of high-quality steel: P≤0,025%; S≤0.015%; Сu≤0.25%. In accordance with the order, the content of Si = 0.10-0.37% can be established. According to TU 14-161-149-94, the chemical composition is given for steel grade 30ХМА for casing pipes and couplings for them of hydrogen sulfide-resistant and cold-resistant ones.

Mechanical properties

Section, mm

t отпуска, °C

sT|s0,2, MPa

σU, MPa

d5, %

y, %

KCU, kJ/m2

HB, MPa

HRC

HRB

Hot-rolled steel and hot rolled with special surface finish

-

-

-

-

-

-

-

≤217

-

-

Steel calibrated and calibrated with special surface finish

-

-

-

440-640

-

-

-

-

-

-

-

-

-

-

-

-

-

≤229

-

-

Forgings. Hardening + Vacation

≤100

-

≥395

≥615

≥17

≥45

≥481

187-229

-

-

≤100

-

≥440

≥635

≥14

≥40

≥530

197-235

-

-

≤100

-

≥490

≥655

≥16

≥45

≥579

212-248

-

-

Seamless hot deformed tubes in the delivery condition heat treated

-

≥392

≥588

≥13

-

-

-

-

-

Blank pieces of pipe fittings. Quenching in oil (or water) from 860-880 °C (exposure for 2.5-4.0 hours depending on the thickness and weight of the workpiece) + Vacation, air cooling

≤120

620-640

≥540

≥813

≥16

≥40

≥392

223-262

-

-

Rolled steel. Quenching in water from 880 °C to + Leave at 500 °C (indicated as the place of clippings sample)

100

-

≥700

≥830

≥17

≥65

≥1344

-

≥27

-

Rolled steel. Quenching in oil at 880 °C + Vacation

-

200

≥1320

≥1520

≥12

≥50

≥690

-

≥49

-

A sample with a diameter of 6 mm, length 30 mm, pressed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s

-

-

≥80

≥130

≥69

≥67

-

-

-

-

Blank pieces of pipe fittings. Quenching in oil (or water) from 860-880 °C (exposure for 2.5-4.0 hours depending on the thickness and weight of the workpiece) + Vacation, air cooling

≤200

640-660

≥395

≥590

≥15

≥40

≥392

187-229

-

-

Rolled steel. Quenching in water from 880 °C to + Leave at 500 °C (indicated as the place of clippings sample)

80

-

≥760

≥890

≥14

≥64

≥1060

-

≥30

-

Rolled steel. Quenching in oil at 880 °C + Vacation

-

300

≥1330

≥1450

≥11

≥51

≥490

-

≥45

-

A sample with a diameter of 6 mm, length 30 mm, pressed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s

-

-

≥41

≥56

≥64

≥100

-

-

-

-

Blank pieces of pipe fittings. Quenching in oil (or water) from 860-880 °C (exposure for 2.5-4.0 hours depending on the thickness and weight of the workpiece) + Vacation, air cooling

≤80

540-600

640-785

≥880

≥13

≥42

≥588

229-286

-

-

Rolled steel. Quenching in water from 880 °C to + Leave at 500 °C (indicated as the place of clippings sample)

120

-

≥690

≥840

≥18

≥63

≥1158

-

≥25

-

Rolled steel. Quenching in oil at 880 °C + Vacation

-

400

≥1220

≥1370

≥12

≥55

≥690

-

≥42

-

A sample with a diameter of 6 mm, length 30 mm, pressed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s

-

-

≥14

≥26

≥55

≥100

-

-

-

-

Rolled steel. Quenching in water from 880 °C to + Leave at 500 °C (indicated as the place of clippings sample)

40

-

≥790

≥930

≥13

≥61

≥1158

-

≥30

-

Rolled steel. Quenching in oil at 880 °C + Vacation

-

500

≥1080

≥1130

≥16

≥60

≥1270

-

≥36

-

Couplings for casing pipe serovodoroda and cold-resistant from steel 30KHMA, thermally and thermo-mechanical processed in the state of delivery on the other 14-161-149-94. In the delivery condition the products and the group of strength, the COP or the EU. In the graph given the values of KCU KCV at different temperatures test KCV+20°C/KCV-40°C&lt;&lt;/th&gt;

-

-

549-657

≥657

≥16

-

≥785/589

-

-

≤98

Rolled steel. Quenching in oil at 880 °C to + Vacation at 650 °C

-

-

≥590

≥730

≥20

≥70

-

-

-

-

Rolled steel. Quenching in water from 880 °C to + Leave at 500 °C (indicated as the place of clippings sample)

60

-

≥740

≥870

≥16

≥64

≥1246

-

≥31

-

Couplings for casing pipe serovodoroda and cold-resistant from steel 30KHMA, thermally and thermo-mechanical processed in the state of delivery on the other 14-161-149-94. In the delivery condition the products and the group of strength, the COP or the EU. In the graph given the values of KCU KCV at different temperatures test KCV+20°C/KCV-40°C&lt;&lt;/th&gt;

-

-

519-617

≥647

≥18

-

≥1177/589

-

-

≤95

Rolled steel. Quenching in oil at 880 °C to + Vacation at 650 °C

-

-

≥490

≥660

≥21

≥70

-

-

-

-

Wire on the other 14-4-385-73 in the delivery condition. Subanguina with pre-annealing to granular pearlite

-

-

441-638

≥10

-

-

-

-

-

Rolled steel. Quenching in oil at 880 °C to + Vacation at 650 °C

-

-

≥520

≥710

≥21

≥69

-

-

-

-

Long products (wire). Quenching in oil at 880 °C + Vacation at 540 °C, cooling in water

15

-

≥735

≥930

≥12

≥55

≥780

-

-

-

Rolled steel. Quenching in oil at 880 °C to + Vacation at 650 °C

-

-

≥480

≥630

≥22

≥75

-

-

-

-

-

-

≥430

≥500

≥22

≥80

-

-

-

-

Seamless hot deformed tubes for installations high pressure on the other 14-3-433-75 in the state of delivery of heat treated (longitudinal samples)

-

-

≥373

≥588

≥10

-

≥981

-

-

-

Rolled steel. Quenching in oil at 880 °C to + Vacation at 650 °C

-

-

≥340

≥330

≥29

≥89

-

-

-

-

Seamless hot deformed tubes for installations high pressure on the other 14-3-433-75 in the state of delivery of heat treated (longitudinal samples)

-

-

≥255

≥490

-

-

-

-

-

-

Seamless cold-deformed pipes for the chemical and petrochemical industries in the state of delivery (indicate the cutting direction of sample)

-

-

≥392

≥588

≥13

-

≥686

169-217

-

-

-

-

≥392

≥588

≥15

-

≥780

169-217

-

-

Description mechanical marks

Name

Description

sT|s0,2

Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%

σU

Limit short-term strength

d5

Elongation after rupture

y

The relative narrowing

KCU

Toughness

HB

Brinell hardness number

HRC

Rockwell hardness (indenter diamond spheroconical)

HRB

Rockwell hardness (indenter steel, spherical)

Physical characteristics

Temperature

Е, HPa

r, kg/m3

R, Mr. · m

l, W/(m · °C)

a, 10-6 1/°C

С, J/(kg · °C)

0

208

7820

230

-

-

-

20

208

7820

230

-

-

-

100

207

7800

-

46

116

462

200

204

7770

-

44

125

-

300

197

7740

-

42

132

462

400

188

7700

-

42

138

-

500

176

7660

-

39

138

-

600

160

-

-

37

-

-

700

-

-

-

36

143

-

800

-

-

-

32

-

-

A description of the physical symbols

Name

Description

Е

The normal elasticity modulus

G

Modulus of elasticity shear torsion

r

Density

l

Coefficient of thermal conductivity

R

UD. the resistivity

Technological properties

Name

The value

Weldability

Limited weldability.

The tendency to temper brittleness

Tend not.

Flock-sensitive sensitivity

Insensitive.

Macrostructure and pollution

Contamination of the steel pipe casing and couplings thereto serovodoroda and cold-resistant on the other 14-161-149-94 non-metallic inclusions (OS, OT, SP, CX) must not exceed the average score of 2.5.